import 'package:english_words/english_words.dart';
import 'package:flutter/material.dart';

void main() {
  final app = new MyApp();
  print("这个app的哈希码:${app.hashCode},key:${app.key}");
  runApp(app);
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
//    return new MaterialApp(
//      title: 'Welcome to Flutter',
//      home: new Scaffold(
//        appBar: new AppBar(
//          title: new Text('Welcome to Flutter'),
//        ),
//        body: new Center(
//          child: new RandomWords(),
//        ),
//      ),
//    );
    return new MaterialApp(
      title: "Startup Name Generator1",
      theme: new ThemeData(
        primaryColor: Colors.white,
      ),
      home: new RandomWords(),
    );
  }
}

class RandomWordsState extends State<RandomWords> {
  final _suggestions = <WordPair>[];
  final _saved = new Set<WordPair>();
  final _biggerFont = const TextStyle(fontSize: 18.0);

  @override
  Widget build(BuildContext context) {
//    final wordPair = WordPair.random();
//    return new Text(wordPair.asPascalCase);
    return new Scaffold(
      appBar: new AppBar(
        title: new Text("Startup Name Generator2"),
        actions: <Widget>[
          new IconButton(icon: const Icon(Icons.list), onPressed: _pushSaved)
        ],
      ),
      body: _buildSuggestions(),
    );
  }

  Widget _buildSuggestions() {
    return ListView.builder(
        padding: const EdgeInsets.all(16.0),
        itemBuilder: (context, i) {
          if (i.isOdd) return new Divider();
          final index = i ~/ 2;
          if (index >= _suggestions.length) {
            _suggestions.addAll(generateWordPairs().take(10));
          }
          return _buildRow(_suggestions[index]);
        });
  }

  Widget _buildRow(WordPair pair) {
    final alreadySaved = _saved.contains(pair);
    return new ListTile(
      title: new Text(
        pair.asPascalCase,
        style: _biggerFont,
      ),
      trailing: new Icon(
        alreadySaved ? Icons.favorite : Icons.favorite_border,
        color: alreadySaved ? Colors.red : null,
      ),
      onTap: () {
        print("点击Item");
        setState(() {
          print("更改❤的状态:$alreadySaved");
          if (alreadySaved) {
            _saved.remove(pair);
          } else {
            _saved.add(pair);
          }
        });
      },
    );
  }

  void _pushSaved() {
    print("打开收藏列表");
    Navigator.of(context)
        .push(new MaterialPageRoute(builder: (BuildContext context) {
      final titles = _saved.map((WordPair pair) {
        return new ListTile(
            title: new Text(
          pair.asPascalCase,
          style: _biggerFont,
        ));
      });
      final divided =
      List.of(ListTile.divideTiles(tiles: titles, context: context));

      return new Scaffold(
        appBar: new AppBar(
          title: const Text("Saved Suggestions"),
        ),
        body: new ListView(children: divided),
      );
    }));
  }
}

class RandomWords extends StatefulWidget {
  @override
  RandomWordsState createState() => new RandomWordsState();
}
